Feature: Provide you clean & purified drinking water directly from streams, puddles, lakes, brook and more Adopt 0.01um ultra filteration membrane cartridge, can remove 99.99% harmful bacteria like colibacillus, legionella, salmonella, keep the water you drink outdoor safe and clean Physical fiteration, chemical-free Can be connected with water bag or bottles (Not Included) Warm Tips: Back Flush Design: regularly blow air through waterstraw after drinking to keep the filters clean and to prevent them from clogging Original Water: Lake, River, Brook, etc Material: Silicone+ABS Color: As shown Total Length: 30cm